Firefox 151 Now Available With Document Picture-in-Picture API
Firefox 151 has been released, introducing several updates to the web browser. Notable features include improvements to built-in VPN support, private browsing, and the Document Picture-in-Picture API. The update also allows for easier profile backups and restorations across macOS and Linux platforms.
- ▪Firefox 151 is the latest monthly update to Mozilla's open-source web browser.
- ▪The Document Picture-in-Picture API allows for an always-on-top window with arbitrary HTML contents.
- ▪Local profile backups are now available for easier transfer and restoration across platforms.
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Firefox 151 Now Available With Document Picture-in-Picture API Written by Michael Larabel in Mozilla on 18 May 2026 at 08:46 AM EDT. Add A Comment Firefox 151 release binaries are now available as the latest monthly update to Mozilla's open-source web browser. While there was talk of Firefox 151 shipping a native JPEG-XL image decoder, that feature was punted to Firefox 152 beta. But there are updates to its built-in VPN support, private browsing improvements, various settings changes, support for merging multiple PDFs directly within the Firefox PDF viewer, and a number of new developer APIs. One change worth noting on the Linux (and macOS) side is that local profile back-ups are now available with support for restoring them across platforms.
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